HID: Switch hiddev to unlocked_ioctl

Push down the BKL. In some cases compat_ioctl already doesn't take the
BKL so we don't either. Some of the locking here seems already dubious
and object lifetimes want documenting

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index 95cc192bc7af..fe4f36472cb7 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -406,6 +406,7 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd,
         uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL);
         if (!uref_multi)
                 return -ENOMEM;
+        lock_kernel();
         uref = &uref_multi->uref;
         if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) {
                 if (copy_from_user(uref_multi, user_arg,
@@ -501,12 +502,15 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd,
                 }
 
 goodreturn:
+                unlock_kernel();
                 kfree(uref_multi);
                 return 0;
 fault:
+                unlock_kernel();
                 kfree(uref_multi);
                 return -EFAULT;
 inval:
+                unlock_kernel();
                 kfree(uref_multi);
                 return -EINVAL;
         }
@@ -540,7 +544,7 @@ static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd,
         return len;
 }
 
-static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 {
         struct hiddev_list *list = file->private_data;
         struct hiddev *hiddev = list->hiddev;
@@ -555,7 +559,10 @@ static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd
         struct usbhid_device *usbhid = hid->driver_data;
         void __user *user_arg = (void __user *)arg;
         int i;
+        
+        /* Called without BKL by compat methods so no BKL taken */
 
+        /* FIXME: Who or what stop this racing with a disconnect ?? */
         if (!hiddev->exist)
                 return -EIO;
 
@@ -768,7 +775,7 @@ static const struct file_operations hiddev_fops = {
         .poll =         hiddev_poll,
         .open =         hiddev_open,
         .release =      hiddev_release,
-        .ioctl =        hiddev_ioctl,
+        .unlocked_ioctl =       hiddev_ioctl,
         .fasync =       hiddev_fasync,
 #ifdef CONFIG_COMPAT
         .compat_ioctl   = hiddev_compat_ioctl,